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VPN
VIRTUAL PRIVATE NETWORKS-VPN
VPN or virtual private network technology allows you to securely connect remote offices and remote users using cost-effective, third-party Internet access. A VPN provides the highest possible level of security through encryption and authentication technologies that protect data traversing the VPN from unauthorized access. You can take advantage of the easy-to-provision Internet infrastructure to quickly add new sites or users, dramatically increasing the reach of your networks without significantly expanding infrastructure.
Virtual private networks, or VPNs, extend the reach of LANs without requiring owned or leased private lines. Companies can use VPNs to provide remote and mobile users with network access, connect geographically separated branches into a unified network and enable the remote use of applications that rely on internal servers.
VPNs can use one or both of two mechanisms. One is to use private circuits leased from a trusted communications provider: alone, this is called a trusted VPN. The other is to send encrypted traffic over the public Internet: alone, this is called a secure VPN. Using a secure VPN over a trusted VPN is called a hybrid VPN. Combining two kinds of secure VPN into one gateway, for instance IPsec and Secure Sockets Layer (SSL), is also called a hybrid VPN.